These gatherings are not permissible, one must not join them as they are bid’ah.

when someone dies the relatives order food for 3 days and everyone eats from it, not just the family of the deceased. after that we don’t have any sort of bidah. no 40 days or 1 yr, etc. what is the ruling on everyone coming together & eating this food? can you plz elaborate this topic so it would be better for us to understand and explain.